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Highly Questionable\n\nA TypeScript / JavaScript library for paranoid developers.\n\n**Caution, experimental!**\n\nHighly Questionable allows you to safely and elegantly handle values that might be null, undefined or Errors, without writing tedious null checks and try-catches everywhere. It is loosely based on the `Option`, `Maybe` and `Result` monads from other languages.\n\nThink of it like a synchronous `Promise`, with `map/catch` methods equivalent to `then/catch`. 'Map' won't be called if the value doesn't exist, and you can handle errors with `catch`.\n\n## Concept\n\nValues are wrapped in a `Perhaps` object. When you want to use the value, you pass perhaps 'mapping' functions that are only run if the value is valid. The output of the 'mapping' gets wrapped in a new `Perhaps`, and so on, so forth, like so:\n\n```typescript\nconst userName = Perhaps.of(userJSON)\n    .map(json =\u003e JSON.parse(json))\n    .map(user =\u003e user.details)\n    .map(details =\u003e details.name);\n```\n\nThere are three things that could normally fail here: JSON.parse might throw an error; the user may not have details; or details may not have a name. `Perhaps` will handle each one gracefully.\n\nWhen you need to actually use a value, there are various methods and checks to make this safe:\n\n```typescript\nuserName.forOne(name =\u003e {\n    // This only runs if userName exists and contains no errors\n    print(name);\n});\n\nif (userName instanceof Something) {\n    // If using TypeScript, the compiler will now know the unwrapped value is safe\n    print(userName.unwrap());\n}\n\nif (userName !== Nothing) {\n    // 'catch' is another way to handle errors, and works like Promise.catch\n    const unwrapped = userName.catch(error =\u003e 'Unretrievable').unwrap();\n    print(unwrapped);\n}\n\nprint(userName.unwrapOr('Anonymous'));\n```\n\nYou can also catch exceptions at your leisure:\n\n```typescript\nuserName.catch(err =\u003e {\n    logException(err);\n    return 'Anonymous'; //  can pass a default to use\n});\n```\n\nAnd throw exceptions when values don't exist:\n\n```typescript\nuserName.unwrapOrThrow(new Error('Could not retrieve user name'));\n```\n\nNote that every `Perhaps` object is immutable: mapping one will create a new instance, unless the output is Nothing (which is a singleton, as all Nothings are the same).\n\nFor more details, consult the [API docs](API.md).\n\n## Setup \u0026 usage\n\nInstalling the package:\n\n```bash\nnpm install highly-questionable\n```\n\nImporting the code:\n\n```typescript\n// TypeScript / ESNext\nimport {Perhaps, Something, Nothing, Problem} from 'highly-questionable';\n```\n\n```javascript\n// Node\nconst {Perhaps, Something, Nothing, Problem} = require('highly-questionable');\n```\n\nTypeScript should work out of the box.\n\n## API\n\nSee [API.md](API.md).\n\n## Due dilligence\n\n### License\n\nThis library is provided under an Apache 2.0 license. For more details, see [LICENSE.md];\n\n### Dependencies\n\nThis project has no production dependencies.\n\n### Library size\n\nAt v1.1, the whole library minified and gzipped amounted to 1018 bytes.\n\n## Contributing / developing\n\n1. Check out the code and install Node\n2. Use `npm install` to install project dependencies\n3. Write your TypeScript\n4. Test with `npm test`\n5. Build the bundle with `npm run build`\n6. Raise a pull request","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjbreckmckye%2Fhighly-questionable","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjbreckmckye%2Fhighly-questionable","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjbreckmckye%2Fhighly-questionable/lists"}